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∂ 2<br />

ɛ<br />

∂a<br />

= 2r + 2Ra <br />

Ra = −r <br />

y (n) r (n) <br />

r (n) ˆ = 1<br />

N−n <br />

(y (n) y (n + k)) ≈ E [y (k) y (n + k)]<br />

N<br />

<br />

k=0

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